Knob assembly and circular tube type stapler

Abstract

The present invention provides a knob assembly and a circular tube type stapler, wherein the knob assembly includes a knob body, a clutch and a knob back cover, a first matching portion is arranged on the knob body, and when the knob body rotates, the screw rod is driven to move along the axial direction of the stapler, a second matching portion is arranged on the clutch, and a compression spring is arranged between the adjusting member and the clutch, and the adjusting member can move axially away from or close to the clutch to change the compression length of the compression spring. The present invention divides the knob assembly into a knob body and a clutch, and when the resistance of the knob reaches a preset resistance value, the clutch cannot drive the knob body to rotate, and the knob assembly enters a failure mode at this time, and the gap between the nail anvil assembly and the nail magazine remains unchanged, and the tissue is not over-compressed; wherein the size of the preset resistance value is related to the spring force of the compression spring at the proximal end of the clutch, and the spring force of the compression spring can be adjusted by changing the distance between the adjusting member and the clutch, so that the size of the preset resistance value can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a knob assembly and a circular tubular stapler. Background Art

[0002] Digestive tract diseases are one of the most common diseases in humans. During the treatment process, circular tubular staplers are often used to replace the doctor's manual operation to anastomose physiological tissues such as the digestive tract. Circular tubular staplers are a common surgical instrument, most of which use axial internal stapling to form end-to-end or end-to-side anastomosis of physiological tissues such as the esophagus, stomach, and intestines during surgery. During the anastomosis, the two sections of tissue are contained inwardly in the stapler. After the firing is completed, a circular anastomosis is formed on the tissue, reconstructing the human body channel.

[0003] In the prior art, a circular tube-type stapler includes a stapler body, an operating handle movably connected to the stapler body, and a nail anvil assembly matched with the body. The stapler body includes a nail magazine assembly arranged at the distal end, the nail magazine assembly includes an annular nail magazine, a cutter; and a knob arranged at the proximal end of the body, the knob can rotate relative to the body, and the interior of the stapler body also includes a nail anvil shaft arranged from the proximal end to the distal end. Here, the distal end and the proximal end are relative to the operator, the end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the surgical site is the distal end. In the stapler, the inner side and the outer side are relative to the axis of the stapler, the side close to the axis is the inner side, and the side away from the axis is the outer side. The nail anvil assembly includes a nail anvil, a nail anvil cap arranged at the distal end of the nail anvil, and a knife anvil arranged inside the nail anvil. The nail anvil assembly can be directly connected to the distal end of the nail anvil shaft or connected through a nail anvil shaft connector. During tumor surgery, after the tumor tissue is cut off and removed, the anvil shaft passes through the purse of the residual tissue and is arranged at the distal end of the stapler body. The knob is rotated to gradually reduce the distance between the anvil assembly and the stapler to a suitable distance, and then the firing state is reached. Only then can the operating handle be held to fire the instrument to complete the anastomosis. With the continuous development of medical devices, circular tube staplers are also increasingly widely used in the treatment of hemorrhoids and other diseases.

[0004] In the process of rotating the knob to move the anvil assembly closer to the nail magazine, sometimes the knob can still be rotated after the tissue is closed. In this way, the anvil assembly and the nail magazine will continue to get closer, continue to compress the tissue, cause excessive squeezing of the tissue, and may even crush the tissue, which is very unfavorable to the surgical outcome. Summary of the invention

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a knob assembly and a circular tubular stapler. When the knob is rotated, when the resistance encountered by the knob reaches a preset resistance value, the knob will no longer be able to transmit a larger torque. At this time, the knob enters a failure mode, and the gap between the anvil assembly and the staple magazine remains unchanged without causing the tissue to be over-compressed, and the preset resistance value is adjustable.

[0006] An embodiment of the present invention provides a knob assembly for a circular tubular stapler, wherein a wire rod is disposed inside the stapler; the knob assembly comprises:

[0007] A knob body, wherein the knob body is sleeved on the outside of the screw rod, a driving member is arranged on the knob body, a first matching portion is arranged on the proximal end surface of the driving member, and when the knob body rotates, the screw rod is driven to move axially;

[0008] A clutch member is located at the proximal end of the driving member, and a second matching portion is provided on the distal end surface of the clutch member, the second matching portion can move axially relative to the first matching portion, and when the second matching portion contacts and matches with the first matching portion, the rotation of the clutch member drives the knob body to rotate;

[0009] The adjusting member is located at the proximal end of the clutch member, a compression spring is arranged between the adjusting member and the clutch member, and the adjusting member can move along the axial direction of the stapler relative to the clutch member.

[0010] Optionally, a second orientation portion is provided on the inner side surface of the adjusting member, the adjusting member is sleeved on the proximal end of the knob body, a first orientation portion is provided on the proximal end of the knob body, the second orientation portion cooperates with the first orientation portion, and the second orientation portion can only move axially relative to the first orientation portion.

[0011] Optionally, a torque adjustment cover is further included, the distal end of the torque adjustment cover cooperates with the proximal end of the adjustment member, and when the torque adjustment cover rotates relative to the knob body, the adjustment member is driven to move along the axial direction of the stapler.

[0012] Optionally, the mating surface between the distal end of the torque adjustment cover and the proximal end of the adjustment member is a spiral surface, or the mating surface between the distal end of the torque adjustment cover and the proximal end of the adjustment member is an inclined surface.

[0013] Optionally, it further comprises a knob housing, the inner side surface of the proximal end of the knob housing is provided with an arc-shaped limit groove, the outer side surface of the torque adjustment cover is provided with a limit block, the limit block is embedded in the limit groove, and the limit block can rotate relative to the limit groove within the extension range of the limit groove;

[0014] Alternatively, a limit block is provided on the proximal inner side surface of the knob housing, and an arc-shaped limit groove is provided on the outer side surface of the torque adjustment cover, the limit block is embedded in the limit groove, and the limit block can rotate relative to the limit groove within the extension range of the limit groove.

[0015] Optionally, the first orientation portion includes at least one first orientation groove extending along the axial direction of the stapler, and the second orientation portion is a first orientation rib corresponding to the first orientation groove one by one, and the first orientation rib extends into the first orientation groove and can move along the extension direction of the first orientation groove; or

[0016] The first orientation portion includes at least one first orientation rib extending along the axial direction of the stapler, and the second orientation portion is a first orientation groove corresponding to the first orientation rib one by one. The first orientation rib extends into the first orientation groove and can move along its own extension direction.

[0017] Optionally, the first mating portion includes at least one first mating piece arranged on the proximal end surface of the driving member, and the second mating portion includes a second mating piece corresponding one-to-one to the first mating piece.

[0018] Optionally, the first matching piece is a first protrusion, and the second matching piece is a second protrusion;

[0019] Or, the first matching piece is a first protrusion, and the second matching piece is a groove;

[0020] Alternatively, the first matching piece is a groove, and the second matching piece is a protrusion.

[0021] Optionally, the first mating piece includes a first side surface, and the second mating piece includes a third side surface. When the clutch piece rotates along a first direction under external force, the first side surface of the first mating piece contacts and fits with the third side surface of the second mating piece, and the first side surface of the first mating piece is inclined toward the first direction.

[0022] Optionally, the first matching member further includes a second side surface, and the second matching member further includes a fourth side surface, and when the clutch member is rotated along the second direction by an external force, the second side surface of the first matching member contacts and matches with the fourth side surface of the second matching member;

[0023] The second side surface of the first matching piece is a right-angled surface, or the second side surface of the first matching piece is inclined toward the second direction and the inclination degree of the second side surface of the first matching piece is smaller than the inclination degree of the first side surface.

[0024] Optionally, the first side surface of the first matching piece and the third side surface of the second matching piece are both planes or matching curved surfaces, and the second side surface of the first matching piece and the fourth side surface of the second matching piece are both planes or matching curved surfaces.

[0025] Optionally, the clutch member includes a clutch ring, and the clutch ring is sleeved on the outside of the knob body.

[0026] Optionally, the stapler further comprises a knob housing, and the inner surface of the knob housing is provided with a fourth matching portion;

[0027] The clutch is located inside the knob housing, and a third matching portion is provided on the side of the clutch, which matches with the fourth matching portion so that the knob housing can drive the clutch to rotate, and the clutch can move axially relative to the knob housing.

[0028] Optionally, the third matching portion includes at least one second orientation groove located on the side of the clutch, and the fourth matching portion includes a second orientation rib corresponding to the second orientation groove one by one, the second orientation rib extends along the axial direction of the stapler and extends into the second orientation groove, and the second orientation groove can move along the extension direction of the second orientation rib; or

[0029] The third matching portion includes at least one second directional rib located on the side of the clutch, and the fourth matching portion includes a second directional groove corresponding to the second directional rib one by one, the second directional rib extends along the axial direction of the stapler and extends into the second directional groove, and the second directional rib can move along its own extension direction.

[0030] Optionally, a step portion is provided on the inner surface of the knob housing, and the step portion is located at the distal end surface of the clutch member.

[0031] Optionally, a knob back cover is further included, wherein the distal end of the knob back cover is provided with a back cover internal thread, and the proximal end of the knob body is provided with a body external thread that matches the back cover internal thread.

[0032] The embodiment of the present invention further provides a circular tubular stapler, comprising the knob assembly.

[0033] The knob assembly and the circular tube-type stapler provided by the present invention have the following advantages:

[0034] The present invention provides a knob assembly for a circular tube-type stapler, wherein the knob assembly is divided into a knob body and a clutch. Before the resistance of the knob body reaches a preset resistance value, the clutch can be rotated to drive the knob body to rotate together, and the knob body can drive the anvil assembly to move along the axial direction of the stapler and approach a staple magazine. After the resistance of the knob reaches the preset resistance value, the clutch cannot drive the knob body to rotate, and the knob assembly enters a failure mode at this time. The gap between the anvil assembly and the staple magazine remains unchanged, and the tissue is not over-compressed. The preset value is the pressure limit of the tissue clamped between the anvil assembly and the staple magazine assembly, and the size of the preset resistance value is related to the spring force of a compression spring at the proximal end of the clutch. By changing the distance between the adjusting member and the clutch, the spring force of the compression spring can be adjusted, thereby adjusting the size of the preset resistance value to achieve the adjustment of the maximum tissue compression force. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0036] Figure 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the cooperation between the knob assembly and the screw rod according to one embodiment of the present invention;

[0038] Figure 3 is a schematic structural diagram of a knob body according to an embodiment of the present invention;

[0039] Figure 4 is a schematic structural diagram of a clutch ring according to an embodiment of the present invention;

[0040] Figure 5 and Figure 6 is a schematic structural diagram of a knob housing according to an embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of an adjusting member according to an embodiment of the present invention;

[0042] Figure 8 is a schematic structural diagram of a torque adjustment cover according to an embodiment of the present invention;

[0043] Fig. 9 is a schematic structural diagram of a first knob back cover according to an embodiment of the present invention;

[0044] Fig.10 is a schematic diagram of a clutch ring and a compression spring in an initial state of an embodiment of the present invention;

[0045] Fig.11 It is a schematic diagram of a clutch ring and a compression spring in a failure state according to an embodiment of the present invention.

[0046] Reference numerals:

[0047] 1 Knob body 42 Step part

[0048] 11 first protrusion 43 limiting groove

[0049] 111 first side 5 adjustment member

[0050] 112 Second side surface 51 First helical surface

[0051] 12 External thread of the body 52 First orientation portion

[0052] 13 Body internal thread 6 Torque adjustment cover

[0053] 14 Driving member 61 Second helical surface

[0054] 15 first directional groove 62 limiting portion

[0055] 2 Clutch ring 7 First knob back cover

[0056] 21 Second protrusion 71 Internal thread of rear cover

[0057] 211 third side 81 stapler body shell

[0058] 212 fourth side 82 staple cartridge assembly

[0059] 22 second orientation slot 83 nail anvil assembly

[0060] 23 Distal end face of clutch ring 84 Handle

[0061] 3 Compression spring 85 Screw rod

[0062] 4 Knob housing 9 Second knob back cover

[0063] 41 Second directional reinforcement DETAILED DESCRIPTION

[0064] Example embodiments will now be described in more detail with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0065] In order to solve the technical problems in the prior art, the present invention provides a knob assembly for a circular tubular stapler, wherein the circular tubular stapler comprises a knob body, a clutch and an adjusting member, wherein the knob body is sleeved on the outside of the screw rod, and a driving member is arranged on the knob body, and a first matching portion is arranged on the proximal surface of the driving member, and the screw rod is driven to move axially when the knob body rotates; the clutch is located at the proximal end of the driving member, and a second matching portion is arranged on the distal surface of the clutch, and the second matching portion can move axially relative to the first matching portion, and when the second matching portion contacts and matches with the first matching portion, the rotation of the clutch drives the knob body to rotate, and the second matching portion has a first state in which the first matching portion can be driven, and a second state in which the first matching portion cannot be driven. When the second mating portion is in a first state, the rotation of the clutch drives the knob body to rotate; when the second mating portion is in a second state, the rotation of the clutch does not drive the knob body to rotate, and the clutch moves axially toward the proximal end relative to the knob body; the adjusting member is located at the proximal end of the clutch, a compression spring is provided between the adjusting member and the clutch, and the adjusting member can move axially along the stapler relative to the clutch.

[0066] Therefore, the present invention divides the knob assembly into a knob body and a clutch, and further provides an adjustment member and a positioning compression spring at the proximal end of the knob body. The axial movement of the clutch toward the distal end of the stapler will be hindered by the compression spring, that is, the axial movement of the clutch needs to overcome the spring force of the compression spring. The driving member of the knob body and the clutch together constitute a clutch structure. When the operator rotates the knob assembly, the clutch is the first to be driven to rotate by the operator's rotational force. Before the resistance experienced by the knob body reaches the preset resistance value, the clutch mechanism can transmit a torque greater than the resistance of the knob body, and the knob body and the clutch are linked. Rotating the clutch can drive the knob body to rotate together, and the knob body can drive the anvil assembly to move along the axial direction of the stapler and approach the stapler magazine; when the resistance experienced by the knob reaches the preset resistance value, the clutch mechanism cannot transmit a torque greater than the resistance of the knob body, and the clutch moves toward the proximal end of the stapler and disengages from the drive member, and compresses the compression spring. At this time, the clutch cannot drive the knob body to rotate, and the knob assembly enters a failure mode. The gap between the anvil assembly and the stapler magazine remains unchanged, and the tissue is not over-compressed.

[0067] Among them, the size of the preset resistance value is determined by the inclination angle of the contact surface between the driving member and the clutch member and the spring force of the compression spring. For the same compression spring, its spring force is different at different compression degrees, and the spring force is equal to the spring stiffness multiplied by the compression amount. Therefore, the greater the compression amount, the greater the spring force, and the smaller the compression amount, the smaller the spring force. Therefore, the present invention further adjusts the size of the preset resistance value by adjusting the initial compression degree of the compression spring. The size of the preset resistance value corresponds to the size of the maximum tissue compression force between the anvil assembly and the stapler assembly on the tissue. Specifically, the compression spring is arranged between the clutch member and the adjusting member, and the adjusting member can move along the axial direction of the stapler. When the adjusting member is close to the clutch member, the preset resistance value is further increased, and when the adjusting member is away from the clutch member, the preset resistance value is further reduced.

[0068] The embodiment of the present invention further provides a circular tube-type stapler, wherein the knob assembly is located at the proximal end of the stapler, and a stapler magazine assembly and a stapler anvil assembly are disposed at the distal end of the stapler, wherein the stapler anvil assembly is connected to the distal end of the screw rod through an stapler anvil shaft or is directly connected to the distal end of the screw rod. When the knob body rotates, the stapler anvil shaft can drive the stapler anvil assembly to move along the axial direction of the stapler to approach or move away from the stapler magazine assembly.

[0069] In the initial state where the anvil assembly and the stapler body with the stapler magazine assembly have just been successfully docked, the knob is rotated in the first direction and the clutch rotates. At this time, since the tissue has not been clamped yet, the resistance of the knob body has not reached the preset resistance value. The clutch mechanism can transmit a torque greater than the resistance of the knob body, and the compression spring maintains the initial state without deformation or a certain amount of initial deformation. The clutch drives the knob body to rotate in the first direction, that is, the second matching portion is in the first state and drives the first matching portion. The anvil assembly is driven by the anvil shaft and the screw rod to gradually approach the stapler magazine assembly.

[0070] When the anvil assembly and the staple magazine assembly reach a suitable distance and the squeezing force on the tissue reaches a suitable predetermined value, the knob is rotated again and the knob body encounters a resistance that hinders rotation in the first direction. This resistance corresponds to the tissue squeezing force between the anvil assembly and the staple magazine assembly. At this time, the knob body can only be rotated in the first direction when a rotational torque greater than the resistance is applied to the knob body. That is, when the resistance is greater than the preset value of the resistance, if a larger rotational torque is applied to rotate the clutch, the reaction force of the rotational torque received by the knob body is applied to the clutch, and the reaction force will overcome the spring force of the compression spring and compress the compression spring to deform, and the clutch will produce axial movement toward the proximal end of the stapler, so that the second mating part of the clutch disengages from the first mating part of the knob body, that is, the second mating part is in the second state without driving the first mating part. At this time, the clutch cannot transmit the rotational torque applied by the operator to the knob body, the knob body will not rotate, the clutch performs invalid idling, and can emit a clicking sound when the first mating part and the second mating part are disengaged. At this time, the knob assembly is in an invalid state, the nail forming gap between the anvil assembly and the nail magazine assembly remains unchanged, and the tissue is not over-compressed.

[0071] The following is a detailed description of a circular tubular stapler and a knob assembly therein provided in one embodiment of the present invention in conjunction with the accompanying drawings.

[0072] like Figure 1 As shown, the structure of a stapler of an embodiment is shown. The stapler includes a stapler body and a nail anvil assembly 83, wherein the stapler body includes a stapler housing 81, a nail magazine assembly 82 located at the distal end of the stapler housing 81, a knob assembly located at the proximal end of the stapler housing 81, and a screw rod 85 arranged from the proximal end to the distal end, the nail magazine assembly 82 includes an annular nail magazine and a cutter, and the nail anvil assembly 83 includes a nail anvil and a nail anvil shaft, and the nail anvil is connected to the distal end of the screw rod through the nail anvil shaft. When the knob assembly rotates, the nail anvil assembly 83 is driven to move axially through the screw rod and the nail anvil shaft in turn, away from or close to the nail magazine assembly 82.

[0073] Of course, in another type of circular tube stapler, such as the circular tube stapler for hemorrhoid surgery mentioned above, the anvil assembly 83 is directly connected to the stapler body, and the anvil assembly 83 cannot be removed from the stapler body. In this case, the anvil assembly 83 does not include an anvil shaft, and the anvil is directly fixedly connected to the distal end of the screw rod 6. The present invention is described by taking this type of stapler as an example.

[0074] like Figures 2 to 9As shown, the knob assembly includes a knob body 1, a clutch and an adjusting member 5, the knob body 1 is sleeved on the outside of the screw rod 85, the knob body 1 is provided with a driving member 14, the proximal surface of the driving member 14 is provided with a first matching portion, the interior of the knob body 1 is provided with a body internal thread 13, the body internal thread 13 is matched with the screw rod 85 of the stapler, and the knob body 1 drives the screw rod 85 to move axially along the stapler when it rotates; the clutch is located at the proximal end of the driving member 14, the distal surface of the clutch is provided with a second matching portion, the second matching portion can move axially relative to the first matching portion, and the second matching portion has a first state in which the first matching portion can be driven, and a second state in which the first matching portion cannot be driven. When the second mating portion is in the first state, the rotation of the clutch drives the knob body 1 to rotate, and when the second mating portion is in the second state, the rotation of the clutch does not drive the knob body to rotate, and the clutch moves axially toward the proximal end relative to the knob body; the adjusting member 5 is located at the proximal end of the stapler, and a compression spring 3 is provided between the adjusting member 5 and the clutch, and the adjusting member 5 can move axially along the stapler relative to the clutch to move away from or close to the clutch.

[0075] In this embodiment, the clutch member includes a clutch ring 2, which is sleeved on the knob body 1, and the adjusting member 5 can be an adjusting gasket. The first matching portion includes at least one first matching member arranged on the proximal surface of the driving member 14, and the second matching portion includes a second matching member corresponding to the first matching member. The first matching member can be a first protrusion 11, and the second matching member can be a second protrusion 21. In other alternative embodiments, the first matching member and the second matching member can also be selected as other structures, such as the first matching member is a protrusion, the second matching member is a groove matching the protrusion, or the first matching member is a groove, the second matching member is a protrusion matching the groove, etc., all of which belong to the protection scope of the present invention. Further preferably, the first protrusion 11 includes a first side surface 111, and the second protrusion 21 includes a third side surface 211. When the clutch ring 2 is rotated in the first direction by an external force, the first side surface 111 of the first protrusion 11 contacts and matches with the third side surface 211 of the second protrusion 21, and the first side surface 111 of the first protrusion 11 is inclined toward the first direction. The inclination direction of the third side surface 211 of the second protrusion 11 is adapted to that of the first side surface 111 .

[0076] In the perspective of the stapler from the proximal end to the distal end, the first direction is the clockwise direction and the second direction is the counterclockwise direction. When the clutch ring 2 is rotated in the clockwise direction and the knob body 1 is driven to rotate in the clockwise direction, the screw rod 6 moves toward the proximal end of the stapler and drives the anvil assembly 83 to approach the stapler assembly 82. When the clutch ring 2 is rotated in the counterclockwise direction and the knob body 1 is driven to rotate in the counterclockwise direction, the screw rod 6 moves toward the distal end of the stapler and drives the anvil assembly 83 away from the stapler assembly 82.

[0077] In this embodiment, the first side surface 111 and the third side surface 211 are matched with inclined surfaces. Through the matching of the inclined surfaces, when the resistance to the knob body 1 is greater than the preset resistance value, the clutch ring 2 is rotated in the first direction by the external force and a large rotation torque is applied to the knob body 1, the reaction force of the knob body 1 on the clutch ring 2 is decomposed through the inclined surface, and the force along the axial direction of the stapler after decomposition pushes the clutch ring 2 to move toward the proximal end of the stapler to overcome the elastic force of the compression spring 3 and deform the compression spring 3, so that the knob body 1 and the clutch ring 2 gradually separate from each other. The preset resistance value can be determined by the spring force of the compression spring 3 and the inclination of the first side surface 111 and the third side surface 211. In addition, due to the setting of the inclination of the first side surface 111 of the first protrusion 11 and the third side surface 211 of the second protrusion 21, when the clutch ring 2 rotates in the clockwise direction and does not cooperate with the knob body 1, the second protrusion 21 that is displaced toward the proximal end is more likely to separate from the first protrusion 11.

[0078] In this embodiment, the first protrusion 11 further includes a second side surface 112, and the second protrusion 21 further includes a fourth side surface 212. When the clutch ring 2 is rotated in the second direction by an external force, the second side surface 112 of the first protrusion 11 contacts and cooperates with the fourth side surface of the second protrusion 21, so that when the clutch ring 2 is rotated in the second direction, the knob body 1 can be driven to rotate in the second direction to increase the distance between the nail anvil 83 and the nail magazine assembly 82.

[0079] In this embodiment, the second side surface 112 of the first protrusion 11 is a right-angled surface, and correspondingly, the fourth side surface 212 of the second protrusion 21 is also a right-angled surface. Here, the right-angled surface refers to the second side surface 112 of the first protrusion 11 being perpendicular to the surface of the driving member 14. In other alternative embodiments, the second side surface 112 of the first protrusion 11 can also be inclined toward the second direction and the inclination degree of the second side surface 112 of the first protrusion 11 is less than the inclination degree of the first side surface 111 of the first protrusion 11. Correspondingly, the inclination direction and angle of the fourth side surface 212 of the second protrusion 21 are adapted to the second side surface 112. In this way, when the clutch ring 2 rotates in the second direction, the second protrusion 21 is not easy to disengage from the first protrusion 11, thereby preventing the knob assembly from being unable to drive the knob body 1 to rotate in the second direction to increase the distance between the anvil assembly 83 and the nail magazine assembly 82 when the reverse operation is required after the knob assembly is tightened in the first direction.

[0080] The first side surface 111 of the first protrusion 11 and the third side surface 211 of the second protrusion 21 are both planes or matching curved surfaces, and the second side surface 112 of the first protrusion 11 and the fourth side surface 212 of the second protrusion 21 are both planes or matching curved surfaces.

[0081] Among them, the size of the preset resistance value is determined by the inclination angle of the contact surface between the driving member 14 and the clutch ring 2 and the spring force of the compression spring 3. For the same compression spring 3, the spring force is different at different compression degrees. Therefore, the present invention further adjusts the size of the preset resistance value by adjusting the initial compression degree, that is, the initial deformation, of the compression spring 3, that is, adjusts the size of the maximum tissue compression force. Specifically, the adjusting member 5 can move along the axial direction of the stapler. When the adjusting member approaches the clutch ring 2, the preset resistance value is further increased, and the maximum tissue compression force is increased. When the adjusting member is away from the clutch ring 2, the preset resistance value is further reduced, and the maximum tissue compression force is reduced. When the stapler is applied to tissues of different thicknesses or tissues have different tolerances to the compression force, the limit of the compression force can be changed by moving the adjusting member 5.

[0082] In this embodiment, the inner side surface of the adjusting member 5 is provided with a second orientation portion, the adjusting member 5 is sleeved on the proximal end of the knob body 1, the proximal end of the knob body 1 is provided with a first orientation portion, the second orientation portion cooperates with the first orientation portion, and the second orientation portion can only move axially relative to the first orientation portion. In this embodiment, the first orientation portion includes at least one first orientation groove 15 extending along the axial direction of the stapler, the second orientation portion is a first orientation rib 52 corresponding to the first orientation groove 15, the first orientation rib 52 extends into the first orientation groove 15 and can move along the extension direction of the first orientation groove 15. In other embodiments, the first orientation portion may also include at least one first orientation rib extending along the axial direction of the stapler, the second orientation portion is a first orientation groove corresponding to the first orientation rib, the orientation rib extends into the groove and can move along its own extension direction.

[0083] In this embodiment, the knob assembly further includes a torque adjustment cover 6, the distal end of which cooperates with the proximal end of the adjustment member 5. When the torque adjustment cover 6 rotates relative to the knob body 1, it drives the adjustment member 5 to move axially along the anastomosis device.

[0084] In this embodiment, the mating surface between the distal end of the torque adjustment cover 6 and the proximal end of the adjustment member 5 is a helical surface. Figure 7 and Figure 8 As shown, the distal end surface of the torque adjustment cover 6 is a second helical surface 61, and the proximal end surface of the adjustment member 5 is a first helical surface. Since the helical surfaces are in surface contact, the degree of matching between the torque adjustment cover 6 and the adjustment member 5 can be improved. In other embodiments, the matching surfaces of the distal end of the torque adjustment cover 6 and the proximal end of the adjustment member 5 can also adopt other matching methods, for example, the matching surfaces of the distal end of the torque adjustment cover 6 and the proximal end of the adjustment member are inclined surfaces.

[0085] In this embodiment, the matching position between the torque adjustment cover 6 and the adjustment member 5 is also limited by the compression spring 3. That is, the compression spring 3 limits the positions of the two matching structures at both ends respectively: the distal end of the compression spring 3 limits the axial matching between the clutch ring 2 and the knob body 1, and the proximal end of the compression spring 3 limits the axial matching between the adjustment member 5 and the torque adjustment cover 6. In this embodiment, one compression spring 3 is used to realize the positions of the two axial matching mechanisms, and the structure is simplified.

[0086] like Fig.10 and 11 As shown, the structures of the knob body 1 and the clutch ring 2 in the initial state and the failure state are respectively shown.

[0087] In the initial state where the anvil assembly 83 and the stapler body have just been successfully docked or the tissue has just been inserted, the knob assembly is in the initial state, and the operator rotates the clutch ring 2 in the first direction. The clutch ring 2 rotates. At this time, because the tissue has not been clamped, the resistance of the knob body 1 has not reached the preset resistance value. The clutch mechanism can transmit the torque greater than the resistance of the knob body 1 from the clutch ring 2 to the knob body 1 through the cooperation between the first protrusion 11 and the second protrusion 21. At this time, the reaction force of the knob body 1 on the clutch ring 2 is not enough to overcome the elastic force of the compression spring 3. Fig.10 As shown, at this time, the compression spring 3 maintains the initial state, without deformation or a certain amount of initial deformation, and the second matching portion is in the first state, that is, the second protrusion 21 of the clutch ring 2 is in full contact and fit with the first protrusion 11 of the knob body 1, and the rotation of the clutch ring 2 drives the knob body 1 to rotate in the first direction, and the anvil assembly 83 is driven by the screw rod 85 to gradually approach the nail magazine assembly 82.

[0088] After the tissue is clamped between the anvil assembly 83 and the staple magazine assembly 82, the clutch ring 2 of the knob assembly is rotated in the first direction, and the knob body 1 will encounter resistance that prevents it from rotating in the first direction. At this time, the knob body 1 can only be rotated in the first direction by applying a rotational torque greater than the resistance to the knob body 1. When the resistance is greater than the preset resistance value, if the operator applies a rotational torque less than the resistance to the clutch ring 2, the clutch ring 2 is hindered by the knob body 1 and cannot rotate. If the operator applies a rotational torque greater than the resistance to rotate the clutch ring 2, the reaction force of the rotational torque to the knob body 1 is transmitted to the clutch ring 2 through the cooperation between the first protrusion 11 and the second protrusion 21. The component of the reaction force in the axial direction will overcome the spring force of the compression spring 3 and compress the compression spring 3 to deform. Fig.11 As shown, the clutch ring 2 will produce axial movement toward the proximal end of the stapler, so that the second protrusion 21 of the clutch ring 2 is separated from the first protrusion 11 of the knob body 1, that is, the second matching portion is in the second state. At this time, the clutch ring 2 cannot transmit the rotational torque applied by the operator to the knob body 1, and the knob body 1 will not rotate. The clutch ring 2 performs invalid idling and can emit a clicking sound when the first protrusion 11 and the second protrusion 21 are disengaged. At this time, the knob assembly is in a failed state, and the staple forming gap between the nail anvil assembly 83 and the nail magazine assembly 82 remains unchanged, and the tissue will not be over-compressed. If the operator hears a clicking sound or can judge from the feel of rotating the knob assembly in the failed state that the current nail anvil assembly 83 has moved into place, the firing operation of the stapler can be performed.

[0089] When the stapler is applied to different tissue cutting and suturing, the state of the tissue is different, and it is necessary to adjust the maximum tissue squeezing force between the anvil assembly 83 and the stapler assembly 82, that is, to adjust the size of the preset resistance value. At this time, it is necessary to rotate the torque adjustment cover 6 so that the adjustment member 5 moves along the axial direction of the stapler, and adjust the compression degree of the compression spring 3 in the initial state, that is, to change the size of the elastic force that needs to be overcome when the second protrusion 21 is separated from the first protrusion 11 and moves toward the proximal end of the stapler. When the adjustment member 5 approaches the clutch ring 2, the initial compression degree of the compression spring 3 increases, and the elastic force that the clutch ring 2 needs to overcome also increases, thereby increasing the maximum tissue squeezing force. On the contrary, when the adjustment member 5 is away from the clutch ring 2, the maximum tissue squeezing force is reduced.

[0090] In this embodiment, the stapler further comprises a knob housing 4, the inner surface of which is provided with a fourth matching portion; the clutch ring 2 is located inside the knob housing 4, and the side of the clutch ring 2 is provided with a third matching portion, and the third matching portion matches with the fourth matching portion, so that the knob housing 4 can drive the clutch ring 2 to rotate, and the clutch ring 2 can move axially relative to the knob housing 4. In this embodiment, the third matching portion comprises at least one second orientation groove 22 located on the axial side of the clutch ring 2, and the fourth matching portion comprises a second orientation rib 41 corresponding to the second orientation groove 22, the second orientation rib 41 extends along the axial direction of the stapler and extends into the second orientation groove 22, and the second orientation groove 41 can move along the extension direction of the second orientation rib 22, so that the clutch ring 2 can rotate together with the knob housing 4, and the clutch ring 2 can move axially relative to the knob housing 4, and the second orientation rib 41 provides a guiding effect for the orientation groove 22. Preferably, two directional grooves 22 and two directional ribs 41 are provided respectively, and they are symmetrically arranged to achieve structural balance and force balance. Of course, there can also be multiple directional grooves or they can be asymmetrically arranged.

[0091] In other embodiments, the third mating portion may also include at least one second directional rib located on the axial side of the clutch ring 2, and the fourth mating portion includes an directional groove corresponding to the directional rib one by one, the directional rib extends along the axial direction of the anastomosis device and extends into the directional groove, and the directional rib can move along its own extension direction.

[0092] Furthermore, an L-shaped step portion 42 is provided on the inner surface of the knob housing 4, and the step portion 42 is located at the distal end surface of the clutch ring 2. The step portion 42 can limit the movement of the clutch ring 2 toward the distal end of the stapler.

[0093] In order to limit the rotation angle of the torque adjustment cover 6, an arc-shaped limit groove 43 is provided on the inner side of the proximal end of the knob housing 4, and a limit block 62 is provided on the outer side of the torque adjustment cover 6. The limit block 62 is embedded in the limit groove 43, and the limit block 62 can rotate relative to the limit groove 43 within the extension range of the limit groove 43. This prevents the torque adjustment cover 6 from reciprocating due to over-rotation when rotating.

[0094] In other embodiments, a limit block may be provided on the proximal inner side surface of the knob housing 4, and an arc-shaped limit groove may be provided on the outer side surface of the torque adjustment cover 6, the limit block is embedded in the limit groove, and the limit block can rotate relative to the limit groove within the extension range of the limit groove.

[0095] In this embodiment, the knob assembly also includes a knob back cover, which includes a first knob back cover 7 and a second knob back cover 9. The distal end of the first knob back cover 7 is provided with a back cover internal thread 71, and the proximal end of the knob body 1 is provided with a body external thread 12 that matches the back cover internal thread 71. The first knob back cover 7 can support and fix the knob body 1, and the second knob back cover 9 can be installed on the proximal side of the first knob back cover 7.

[0096] The circular tubular stapler provided by the present invention has the following advantages:

[0097] The present invention provides a knob assembly for a circular tube-type stapler, wherein the knob assembly is divided into a knob body and a clutch. Before the resistance of the knob body reaches a preset resistance value, the clutch can be rotated to drive the knob body to rotate together, and the knob body can drive the anvil assembly to move along the axial direction of the stapler and approach a staple magazine. After the resistance of the knob reaches the preset resistance value, the clutch cannot drive the knob body to rotate, and the knob assembly enters a failure mode at this time. The gap between the anvil assembly and the staple magazine remains unchanged, and the tissue is not over-compressed. The preset resistance value is the pressure limit of the tissue clamped between the anvil assembly and the staple magazine assembly, and the size of the preset resistance value is related to the spring force of the compression spring at the proximal end of the clutch. By changing the distance between the adjusting member and the clutch, the spring force of the compression spring can be adjusted, thereby adjusting the size of the preset resistance value, thereby achieving the adjustment of the tissue pressure limit.

[0098] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A knob assembly, characterized in that: Used for a circular tube-type stapler, a wire rod is arranged inside the stapler; the knob assembly comprises: A knob body, wherein the knob body is sleeved on the outside of the screw rod, a driving member is arranged on the knob body, a first matching portion is arranged on the proximal end surface of the driving member, and the first matching portion includes at least one first matching member arranged on the proximal end surface of the driving member, and the screw rod is driven to move axially when the knob body rotates; A clutch member is located at the proximal end of the driving member, and the clutch member is arranged outside the knob body, and a second matching portion is arranged on the distal end surface of the clutch member, and the second matching portion includes a second matching portion corresponding to the first matching portion one by one, and the second matching portion can move axially relative to the first matching portion, and when the second matching portion contacts and matches with the first matching portion, the rotation of the clutch member drives the knob body to rotate; An adjusting member, located at the proximal end of the clutch member, a compression spring is arranged between the adjusting member and the clutch member, and the adjusting member can move relative to the clutch member along the axial direction of the stapler; Wherein, the first matching piece is a first protrusion, and the second matching piece is a second protrusion or a groove; or, the first matching piece is a groove, and the second matching piece is a protrusion.

2. The knob assembly according to claim 1, characterized in that: The inner side surface of the adjusting member is provided with a second orientation portion, the adjusting member is sleeved on the proximal end of the knob body, the proximal end of the knob body is provided with a first orientation portion, the second orientation portion cooperates with the first orientation portion, and the second orientation portion can only move axially relative to the first orientation portion.

3. The knob assembly according to claim 2, characterized in that: It also includes a torque adjustment cover, the distal end of which cooperates with the proximal end of the adjustment member. When the torque adjustment cover rotates relative to the knob body, it drives the adjustment member to move along the axial direction of the stapler.

4. The knob assembly according to claim 3, characterized in that: The matching surface between the distal end of the torque adjustment cover and the proximal end of the adjustment member is a spiral surface, or the matching surface between the distal end of the torque adjustment cover and the proximal end of the adjustment member is an inclined surface.

5. The knob assembly according to claim 3, characterized in that: It also includes a knob housing, wherein the inner side surface of the proximal end of the knob housing is provided with an arc-shaped limit groove, and the outer side surface of the torque adjustment cover is provided with a limit block, the limit block is embedded in the limit groove, and the limit block can rotate relative to the limit groove within the extension range of the limit groove; Alternatively, a limit block is provided on the proximal inner side surface of the knob housing, and an arc-shaped limit groove is provided on the outer side surface of the torque adjustment cover, the limit block is embedded in the limit groove, and the limit block can rotate relative to the limit groove within the extension range of the limit groove.

6. The knob assembly according to claim 2, characterized in that: The first orientation portion includes at least one first orientation groove extending along the axial direction of the stapler, and the second orientation portion is a first orientation rib corresponding to the first orientation groove one by one, and the first orientation rib extends into the first orientation groove and can move along the extension direction of the first orientation groove; or The first orientation portion includes at least one first orientation rib extending along the axial direction of the stapler, and the second orientation portion is a first orientation groove corresponding to the first orientation rib one by one. The first orientation rib extends into the first orientation groove and can move along its own extension direction.

7. The knob assembly according to claim 1, characterized in that: The first mating piece includes a first side surface, and the second mating piece includes a third side surface. When the clutch piece rotates along a first direction under external force, the first side surface of the first mating piece contacts and fits with the third side surface of the second mating piece, and the first side surface of the first mating piece is inclined toward the first direction.

8. The knob assembly according to claim 7, characterized in that: The first matching member further includes a second side surface, and the second matching member further includes a fourth side surface. When the clutch member is rotated in the second direction by an external force, the second side surface of the first matching member contacts and matches with the fourth side surface of the second matching member. The second side surface of the first matching piece is a right-angled surface, or the second side surface of the first matching piece is inclined toward the second direction and the inclination degree of the second side surface of the first matching piece is smaller than the inclination degree of the first side surface.

9. The knob assembly according to claim 7, characterized in that: The first side surface of the first matching piece and the third side surface of the second matching piece are both planes or matching curved surfaces, and the second side surface of the first matching piece and the fourth side surface of the second matching piece are both planes or matching curved surfaces.

10. The knob assembly according to claim 1, characterized in that: The clutch member comprises a clutch ring, and the clutch ring is sleeved on the outside of the knob body.

11. The knob assembly according to claim 1, characterized in that: The stapler further comprises a knob housing, and a fourth matching portion is provided on the inner surface of the knob housing; The clutch is located inside the knob housing, and a third matching portion is provided on the side of the clutch, which matches with the fourth matching portion so that the knob housing can drive the clutch to rotate, and the clutch can move axially relative to the knob housing.

12. The knob assembly according to claim 11, characterized in that: The third matching portion includes at least one second orientation groove located on the side of the clutch member, and the fourth matching portion includes second orientation ribs corresponding to the second orientation grooves one by one, the second orientation ribs extend along the axial direction of the stapler and extend into the second orientation grooves, and the second orientation grooves can move along the extension direction of the second orientation ribs; or The third matching portion includes at least one second directional rib located on the side of the clutch, and the fourth matching portion includes a second directional groove corresponding to the directional rib one by one, the second directional rib extends along the axial direction of the stapler and extends into the second directional groove, and the second directional rib can move along its own extension direction.

13. The knob assembly according to claim 11, characterized in that: The inner surface of the knob housing is provided with a step portion, and the step portion is located at the distal end surface of the clutch member.

14. The knob assembly according to claim 1, characterized in that: It also includes a knob back cover, the distal end of the knob back cover is provided with a back cover internal thread, and the proximal end of the knob body is provided with a body external thread that matches the back cover internal thread.

15. A circular tubular stapler, characterized in that: A knob assembly comprising any one of claims 1 to 14.

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